Portable auxiliary battery



FIG. 1 is a perspective view of a portable auxiliary battery, showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The dash-dash broken lines in the drawings show portions of the portable auxiliary battery which form no part of the claimed design. The dot-dash broken lines in the drawings represent boundaries which form no part of the claimed design. 

CLAIM We claim, the ornamental design for a portable auxiliary battery, as shown and described. 